Path: ...!Xl.tags.giganews.com!local-1.nntp.ord.giganews.com!news.giganews.com.POSTED!not-for-mail NNTP-Posting-Date: Mon, 27 May 2024 17:27:02 +0000 From: Joe Gwinn Newsgroups: sci.electronics.design Subject: Re: Small magnetic tunable filter for 6G and beyond Date: Mon, 27 May 2024 13:27:02 -0400 Message-ID: References: User-Agent: ForteAgent/8.00.32.1272 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 38 X-Usenet-Provider: http://www.giganews.com X-Trace: sv3-iDhWwNLaFpclNjCBBgC/ZCjpI5E9AQIyaQM5Ba+OxY5E43EnZ7/7PXKhHznC7TWUqTmvxhu55ct76Uq!Zx3FV/DhpzQwQmiYdXpGkfJmu3+TZ8fFSqv0SIRO3IZn0acy5Dqr8GOEXEveInathbzMWf0= X-Complaints-To: abuse@giganews.com X-DMCA-Notifications: http://www.giganews.com/info/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 3311 On Mon, 27 May 2024 05:08:40 GMT, Jan Panteltje wrote: >To 6G and beyond: Engineers unlock the next generation of wireless communications: > https://www.sciencedaily.com/releases/2024/05/240524114938.htm >Source: > University of Pennsylvania School of Engineering and Applied Science >Summary: > Engineers have developed a new tool that could unlock 6G and the next generation of wireless networks: an adjustable filter that can successfully prevent interference in high-frequency bands of the electromagnetic spectrum. >partial quote: > What makes the filter adjustable is a unique material, "yttrium iron garnet" (YIG), > a blend of yttrium, a rare earth metal, along with iron and oxygen. > "What's special about YIG is that it propagates a magnetic spin wave," says Olsson, > referring to the type of wave created in magnetic materials when electrons spin in a synchronized fashion. > When exposed to a magnetic field, the magnetic spin wave generated by YIG changes frequency. > "By adjusting the magnetic field," says Xingyu Du, a doctoral student in Olsson's lab and the first author of the paper, > "the YIG filter achieves continuous frequency tuning across an extremely broad frequency band." > As a result, the new filter can be tuned to any frequency between 3.4 GHz and 11.1 GHz, > which covers much of the new territory the FCC has opened up in the FR3 band. As with many breathless announcements of breakthroughs, this may not fare well in reality, for all the reasons mentioned up thread. But anyway, here is the full announcement: .. The item about LightSquared is amusingly off-mark: The problem with LightSquared was that their proposed ground-based transmissions were far too strong, and threatened to overwhelm existing GPS receivers, in particular those in safety-of-flight involved GPS receivers. Inventing a fancy new filter won't help any more than boring old filter technologies, as it's the GPS receivers would need to be updated and recertified, which is a very big deal. I haven't looked, but I bet there is an arXive paper on the yig filter details. Joe Gwinn